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First of all, don’t shop for bargain lights—often, you’ll end up with a faulty or broken strand, full of dead bulbs or less-than-luminous brightness. Choose quality lights that will last you many years—LED lights have been known to last as long as 100,000 hours. Second, plan ahead and purchase lights for next year’s Christmas during this year’s post-holiday sales. Finally, have a vision and a plan—if you know the measurements of your home, including any windows, doors, and outside bushes you wish to light up, you should be able to only purchase the necessary lights and not more than you need.

No, you should not leave LED Christmas lights up all year. While the LED lights themselves are very durable, their wiring and casings can be as vulnerable as any Christmas lights. They’re subject to drying out, experiencing cold or sun damage that causes them to crack, and even damage caused by gnawing pests. (The same is true of incandescents.) If you want your lights to last the years that they’re rated for, bring them inside after Christmas is over. 

While Christmas lights are a wonderful way to light up your home during the holiday season, they don’t have a long lifespan. Most incandescent Christmas light bulbs are designed to last between 1,000 and 1,500 hours—or about one to three holiday seasons. More durable LED bulbs should last about 10 times as long. 

Outdoor Christmas lights cost between $80 to $300 on average without installation. This comes out to about $4 to $50 per strand. You can get a box of outdoor Christmas lights for as little as $20, if you just want to decorate a small area, like a doorway. If you want to go all out and cover your entire home, you'll need between 10 to 20 strands of 100 to 200 bulbs each.